Spark plug



Jan. l0, 1928.

E. H. EILER 1655990 SPARK PLUG Filed Ausl. 27, 1926 mgm v By M201.

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lilly lltfllllltlllllllfll Ellit-tlllliil lilllllltllil-w llppliezlton tiled llngnet lll, lilith.

rllhis invention rela/tes to new snel iisefnl improvements in sperh pings rind hais for its priiniiry object to provide ii plug` wherein the wire littnel'iinggl end of the inziin electrode is equipped with nierins to posi'livel)v prevent the entire detachment oi the wire binding screw from the electrode, necessitilting the etteohinent of the wire b v wrapping the .is-Linie rlroond the electrode which et inost is highly7 iiiisetisfnotory.

',llie invention further minis Vto provide il' ineens for preventing the entire detechinent of the binding nut that ie of such nutrire es to not materially increase the cost of insnlr facture of the plug insoinuch its the sinne is ertreinely simple o-f construction sind inenpensive of manufacture llfith the foregoing)1 sind other objects in view es the nature of the invention will be better understood, the seine consists of the novel forni, combination end arrangement of parts hereinzifter inore fully described, shown in the accompanying drewing; enel eleiined ln the drawing wherein hire reference characters indicate correspondingr parte throughout both the views Figure l is e fragmentary elevation of :i sperlr plug constructed in accordance with the present invention.

leignre 2 is e detail vertiezil section thereof., and

Figure 3 is el group perspective disclosing the upper end of the plugw inein electrode tou gether with the ineens for pireventing the entire detachment of the binding nut therefroin prior to the permanent essocizition of seid ineens with said electrode.

flow havingparticolar reference to the drawing, 5 designates gener-ally e conventional forni of speri; plug .equipped with li inein electrode 6 that is of n length to ei.:- tend considerably above the upper end of the plug; porcelain so is to threededly receive the nsnal binding" nut 7, seid electrode ob vionsly being threaded.

ln. carrying ont the present invention, l.

lli-:rien lleu Illlllillltt provide en electrode wherein the ripper end 'thereof is provided `with il reduced und unthreaded el'qlension el for receiving,y ai heed l) of :inv suitable design9 preferably of the invertciil conical shape es dieciosed7 seid heed be ing)` obviously provided with al vertical bore iti for receiving the ertension of seid electrode l. ller the disposition of sind heed ll upon the einension tl the end of the entension is llsttened es :it ll so es to prevent the detoclnnent of the head from the entension.

llbvioosly the binding init l" inny be 'turned upwardly upon the electrode o zi sufficient distance to enable the condncting` wire to be attached to the electrode beneath sind not, but by relison of the heed 9 the not will be prevented frein entire reinovsl from the electrode nene-ily :resulting in the loss of the seine.

lflevinrqf thus described the inventionj what l cliiiin es new is ln n spin-lr plug of the class described, :i inziin threaded electrode eirteiidiiig` bevond the upper end of the plop; porcelain, :i binding init tlireeded on the projecting end of electrodey on nnthreeled reduced entension pin formed on the opper end of the electredej hond arranged on the reduced nnthreaded extension pin, the bottoni of seid heed engaging the shoilliilcr formed et the juncture of the electrode with the extension piin the ripper end of the pin being; lilitteiied, end engaging the upper cnil of the heard to pennencntljy7 secure the heed on the pin, the top of the-binding; nll't being norinell),7 spliced frein the bottom of the hoed to permit seid bindinpil not to niove npwllrdly whereby to perinit li conductor wire to be ettoched to the electrode end held thereon when the binding init is 'turned dowi'iwnrdlv, seid heed providing; :in zibntinent to liniit the upward niovelnent of the binding.;` not :ind prevent the dispinceinent of the saline frein the threaded end of the electrode.

lin testiinonpT whereof ll #cillin my signature,

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